Microsoft started selling Surface tablets in mid-October when pre-orders began for the Surface RT. Since then, the company has never released any sales figures for the Surface RT or the Surface Pro tablets that it launched in February 2013. Today, Microsoft finally offered some public information about how much money the Surface tablets have brought in from their launch until the end of the company's last fiscal year, which ended on June 30.

In a financial disclosure sent to the U.S. Securities and Exchange Commission, Microsoft showed that Surface tablet sales totaled $853 million during that time period. There's no word on how many of those sales were for the cheaper Surface RT or for the more expensive Surface Pro. However, it is likely the only numbers Microsoft will ever reveal so we should be happy that they offered any revenue breakdowns at all.